/vp/ bros, i want to finally beat Battle Frontier on Emerald but i first need to get some cool mons and i was thinking about these 3 in particular, any ideas or advices (like what item should they carry) are appreciated

Modest Salamance
Flamethrower
Dragon Claw
Hydro pump
Crunch
(Ev distribution i don't know yet)

Metagross (nature i don't know yet, i kinda want to make him a mixed attacker)

Meteor Mash
Psychic
Earthquake/Brick Break??
Agility
(Evs don't know)

Quiet Swampert

Surf/Hidro pump?
Ice Beam
Earthquake
Counter

(Evs don't know yet)

What can be improved, bros?